One of the very first step is of course to check your webcam connection.
Most webcams use the USB port to connect to the PC, so check if your USB cable is properly plugged.
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It might be that the hardware is recognized as a camera, but the right drivers are not installed.
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In most cases the webcam will be automatically activated by software that can use the webcam, but for some computer brands it is necessary to press a certain key-combination to activate the webcam (it will be a Function key, either with Alt or Ctrl or the Fn key, but check the laptop manual for details).
Some known key combinations: (Neo laptops) The next thing is to do is to check your Windows Device Manager and see if all hardware is recognized and installed properly.